[PSUBS-MAILIST] CO2 ppm

[Sean T. Stevenson via Personal_Submersibles]

Just for reference, the level of CO2 in atmospheric air as of 2014 is
about 400 ppm.

Sean


On 2014-06-07 17:39, Sean T. Stevenson via Personal_Submersibles wrote:
> Hank, 0.5% by volume is your maximum allowable, which is 5000 ppm, so
> technically that reading is okay; however if that is steady state, it
> doesn't provide a lot of margin for error.  How are you measuring the
> CO2?  I would check the calibration of the transducer, and also check
> that in an elevated CO2 environment (unmanned), turning the scrubber
> on will bring the level down to ~0 after some period of time.  The
> scrubber needs to keep up with the worst-case breathing / metabolism
> rate of the occupants.  Under ideal conditions (low stress, low
> exertion, fresh scrubber media), the scrubber should be capable of
> keeping the CO2 level at the low end of the allowable range.  A slow
> and steady climb in level is your indication that the media is
> becoming exhausted - you don't want to lose that early warning by
> operating close to maximum.
>
> Sean
>
>
> On 2014-06-07 17:26, hank pronk via Personal_Submersibles wrote:
>> I am heading to Slocan Lake tomorrow for work and a sub dive.  Today
>> I did another life support test and the best I can do is 3700 ppm
>> CO2, I think the absorbent is not so good or something.  Is 3700ppm
>> good to go.
>> Hank
>
>
>
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